By Jan Suszkiw
Remember back in the old days when penicillin was the drug of choice for dealing with infections in your cattle? Or even before then, when it saved soldiers’ lives in World War II?
It was indeed a miracle drug. But decades of widespread use enabled some germs to develop resistance to it.
And it may someday be back on the list of go-to antibiotics, thanks to soil-dwelling members of the bacterial group Streptomyces. These bacteria secrete a compound called "tunicamycin" to keep rival bacteria from reaching choice resources, like rotting plant material. This includes dispatching germs like the bacterium Staphylococcus aureus, which causes infection in humans and animals.
Tunicamycin works by forming holes in the cell walls of encroaching bacteria, causing them to burst open and die. Researchers have known of tunicamycin for decades and were initially excited by its medical and veterinary prospects—especially as a way to overcome the resistance of some germs to penicillin-based drugs like oxacillin and methicillin. Problem was, tunicamycin also blocked a key protein in human and animal cells, undercutting its potential use in the ground war on germs.
Now, however, tunicamycin could get a new lease on life. USDA Agricultural Research Service (ARS) scientists have devised a method to retool the compound so that it poses little to no danger to human or animal cells but can still kills germs.
In laboratory trials, mixing the modified tunicamycin with oxacillin and other penicillin-based drugs made them 32 to 64 times more potent, according to ARS chemist Neil Price and colleagues at the agency's National Center for Agricultural Utilization Research (NCAUR) in Peoria, Illinois; the University of Illinois College of Medicine, and the Chinese Academy of Sciences.
Additionally, the modified tunicamycin didn't harm cultures of human and hamster cells when it was added to them in tests for toxicity, the team reported in a recent issue of the Journal of Antibiotics.
Suszkiw is an ARS public affairs specialist